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Decode directly into the audio renderer's buffer to avoid a copy

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This commit is contained in:
Cameron Gutman
2019-05-01 21:27:41 -07:00
parent 187f47a353
commit 21f2b1224a
9 changed files with 70 additions and 63 deletions
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app/streaming/audio/renderers/soundioaudiorenderer.cpp
+16 -11
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@@ -284,7 +284,20 @@ bool SoundIoAudioRenderer::prepareForPlayback(const OPUS_MULTISTREAM_CONFIGURATI
return true;
}
bool SoundIoAudioRenderer::submitAudio(short* audioBuffer, int audioSize)
void* SoundIoAudioRenderer::getAudioBuffer(int* size)
{
// We must always write a full frame of audio. If we don't,
// the reader will get out of sync with the writer and our
// channels will get all mixed up. To ensure this is always
// the case, round our bytes free down to the next multiple
// of our frame size.
int bytesFree = soundio_ring_buffer_free_count(m_RingBuffer);
int bytesPerFrame = m_OpusChannelCount * m_OutputStream->bytes_per_sample;
*size = qMin(*size, (bytesFree / bytesPerFrame) * bytesPerFrame);
return soundio_ring_buffer_write_ptr(m_RingBuffer);
}
bool SoundIoAudioRenderer::submitAudio(int bytesWritten)
{
if (m_Errored) {
return false;
@@ -293,16 +306,8 @@ bool SoundIoAudioRenderer::submitAudio(short* audioBuffer, int audioSize)
// Flush events to update with new device arrivals
soundio_flush_events(m_SoundIo);
// We must always write a full frame of audio. If we don't,
// the reader will get out of sync with the writer and our
// channels will get all mixed up. To ensure this is always
// the case, round our bytes free down to the next multiple
// of our frame size.
int bytesFree = soundio_ring_buffer_free_count(m_RingBuffer);
int bytesPerFrame = m_OpusChannelCount * m_OutputStream->bytes_per_sample;
int bytesToWrite = qMin(audioSize, (bytesFree / bytesPerFrame) * bytesPerFrame);
memcpy(soundio_ring_buffer_write_ptr(m_RingBuffer), audioBuffer, bytesToWrite);
soundio_ring_buffer_advance_write_ptr(m_RingBuffer, bytesToWrite);
// Advance the write pointer
soundio_ring_buffer_advance_write_ptr(m_RingBuffer, bytesWritten);
return true;
}